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Add texture cache with proper reference handling. This avoids deletion of textures while still being active on the GPU. Test case and fix by m(att)giuca

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@4151 dfc29bdd-3216-0410-991c-e03cc46cb475

Break textureRenderStates test again by adding the test case for the dangling pointer (white texture OpenGL) problem. Fix will follow later, patch exists on the tracker already.

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Fix software renderer inconsistency with rest of drivers in case of invalid destination rect for draw2DImage. Now no driver will render an image in these cases.
Added a test case to check behavior of all drivers for this situation.
Fixed comparison of similar test case to support fuzzy comparison and relaxed threshold.

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Fix pixel alignment and draw2DLine inconsistent offset problems. New test added to make sure that drawPixel and draw2DLine use the same alignment.

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- Restored the ability to set a textures by a float interface, but this solution was marked as deprecated.

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This is done to allow all tests running through even when one has a problem. Otherwise people just comment-out the asserts. The macro will log file, line and assert-test to the tests.log.


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Clarify IGUIEnvironment::getHovered documentation as it's nearly never what the user really should use.


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Added setName and getName to IGUIElement, the same way as it's in ISceneNode. Note: I don't yet add a function like ISceneManager::getSceneNodeFromName to IGUIEnvironment as well. The reason is that current implementations of related functions ISceneManager::getSceneNodeFromId and IGUIElement::getElementFromId are done very different and I first have to figure out if there's any way to reconcile those sanely.


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irr::s64 now compiles with -ansi and -pendentic on gcc without warnings. Also can now be disabled completely by define.


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- line2d::getLength now returning type T. f64 would actually be fine, but then it has to be used throughout, here the cast to T happens before already, so returning f64 is just confusing as looks like it would return a greater accuracy than it has at that point.

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Add irr::s64 back in (using long long for non VS compilers). If there's any problem with this please inform me, I'd like that to stay in as it makes Irrlicht a lot easier to use in combination with the Clipper library (a boost-licensed library for working with 2d polygons).

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- line2d::getClosestPoint can now also get the closest point on the line additional to only checking for closest point on the line-segment.
- Avoid division by zero in line2d::getClosestPoint when start- and endpoint are identical.

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